Call for testers: Apple ATA DMA

[Nathan Whitehorn]

Marcel Moolenaar wrote:
> 
> On Sep 22, 2008, at 12:38 PM, Maxim Sobolev wrote:
> 
>> Nathan Whitehorn wrote:
>>> Nathan Whitehorn wrote:
>>>> Maxim Sobolev wrote:
>>>>> Nathan,
>>>>>
>>>>> Do you have any news regarding the patch in question? I hope you 
>>>>> did not give up, the lack of ATA DMA support is IMHO probably the 
>>>>> biggest issue for the FreeBSD on PowerMacs now. The hardware is 
>>>>> very attractive for SOHO applications, so that having this feature 
>>>>> is important.
>>>> Right now, modes up to WDMA2 work. The UDMA modes cause hangs for 
>>>> reasons not entirely clear. I'm investigating it, but am in the 
>>>> Netherlands at the moment and it will have to wait until I get back.
>>> I now have UDMA modes working on my Shasta controller -- there was a 
>>> stupid bug where I forgot to set the device to accept transfers in 
>>> the selected mode. Please give this patch a test: I expect that UDMA 
>>> modes now work everywhere.
>>> http://people.freebsd.org/~nwhitehorn/apple-ata-dma.patch
>>
>> Nathan,
>>
>> The patch works here (G4 Mac Mini, 1.25GHz), however, I see some weird 
>> things happening in the interrupt domain.
> 
> Interesting. My G4 Mac Mini 1.5Ghz is hanging hard:
> 
>     :
> ad0: 76319MB <Seagate ST9808211A 3.07> at ata1-master UDMA100
> acd0: DVDR <MATSHITACD-RW CW-8124/DACD> at ata1-slave UDMA33
>     *hang*
> 
> Could be related...
> 

If it is, removing the USE_DBDMA_IRQ stuff in ata_macio.c should solve 
it. This might solve Peter's problem too.
-Nathan